JP5584248B2 - One-way clutch and one-way clutch unit - Google Patents

Description

  The present invention relates to a one-way clutch and a one-way clutch unit that transmit rotational force only in one direction.

  The one-way clutch is a clutch that transmits the rotational force in only one direction of the shaft to the outer ring (see, for example, Patent Document 1). When the shaft rotates in the direction in which the rotational force can be transmitted, the rolling elements installed between the wedge-shaped space formed on the outer ring and the shaft are pressed by the leaf springs to reach the meshing state, and the rotational force of the shaft Is transmitted to the outer ring. On the other hand, when the shaft rotates in the reverse direction, the rolling element moves to the wide part of the wedge-shaped space, so that the meshing state of the rolling element is released and the rotation of the shaft is idle, and the rotational force is not transmitted to the outer ring. It becomes. Such a one-way clutch is used for a paper feed mechanism inside a so-called OA device such as a printer or a copying machine.

  FIG. 8 is a block diagram showing an example of a conventional one-way clutch 10. FIG. 8 (a) is a front view, FIG. 8 (b) is a partially cutaway rear view, and FIG. 8 (c) is a view in FIG. It is sectional drawing in XX. The outer ring 11 of the one-way clutch 10 is formed in a cylindrical shape and has a through hole 12 for allowing the shaft to pass therethrough. A plurality of wedge-shaped spaces 13 are formed in the circumferential direction on the inner diameter surface of the outer ring 11, and rolling elements 14 are accommodated in the wedge-shaped spaces 13, and plate springs 15 that press the rolling elements 14 are accommodated. . The shield member 16 seals the wedge-shaped space 13 at one end of the outer ring 11 so that the rolling elements 14 housed in the wedge-shaped space 13 do not exit the wedge-shaped space 13.

  The shaft is inserted into the through hole 12. Thereby, the outer surface of a shaft and the outer surface of the rolling element 14 contact. Now, when the shaft rotates in the direction of arrow A in FIG. 8B, the rolling element 14 is pushed by the leaf spring 15 and moves in the direction of arrow A, from the wide portion to the narrow portion of the wedge-shaped space 13. Since it moves, the rolling element 14 is brought into mesh with the shaft and the outer ring 11 in the wedge-shaped space 13, and the rotational force of the shaft is transmitted to the outer ring 11.

  On the other hand, when the shaft rotates in the direction of arrow B, which is the opposite direction of arrow A, the rolling element 14 presses the leaf spring 15 and moves to the wide portion of the wedge-shaped space 13. Accordingly, the meshing state of the rolling elements 14 is released, the rotation of the shaft is idle, and the rotational force is not transmitted to the outer ring 11.

  As described above, the one-way clutch is a clutch that transmits the rotational force in only one direction of the shaft to the outer ring 11 and can turn on / off the transmission of the rotational torque. Is used to continuously send out.

JP 2000-356230 A

  However, in the conventional example, the durability of the one-way clutch is good, but when viewed as a one-way clutch unit in which the shaft is mounted in the through hole, the durability of the shaft used is relatively weak compared to the one-way clutch. Therefore, it is necessary to increase the durability of the shaft. That is, the durability of the shaft must be improved by induction-hardening an iron-based material, carburizing and quenching, and further processing such as plating. If it does so, the countermeasures on quality, such as a deformation | transformation accompanying these processes, a dimensional change, and a film layer being formed, will be needed, the processing man-hour accompanying a process will increase and cost will become high.

  An object of the present invention is to provide a one-way clutch and a one-way clutch unit that are excellent in durability, high in quality, and capable of reducing the number of processing steps.

The one-way clutch according to the invention of claim 1 is an outer ring made of a sintered member having a wedge-shaped space formed on a cylindrical inner surface, a rolling element positioned in the wedge-shaped space of the outer ring, and the rolling element in the wedge shape A leaf spring that presses toward the narrow part from the wide part of the space, a cylindrical inner ring that is inserted into the inner diameter of the outer ring and whose outer diameter surface is in contact with the inner diameter surface of the outer ring, and the rolling element is the wedge-shaped space and a shield member in which the inner ring when said inner ring is inserted into the outer ring can be prevented from getting out through the outer ring with sealing said wedge-shaped space so as not out, the inner ring, the iron plate It is manufactured by stamping, curling the punched iron plate, joining the joint and barrel polishing, increasing the hardness by heat treatment, and performing centerless polishing. When punching the iron plate with the press, the joint of the inner ring The widthwise both end portions of the iron plate is obliquely cut so that the oblique, the inner ring when rotated toward the narrow portion from the wide portion of the wedge-shaped space is pressed against the rolling elements into the narrow portion outer ring And when rotating from the narrow part to the wide part of the wedge-shaped space, the pressing of the rolling element to the narrow part is released and the wheel rotates idly.

The one-way clutch according to the invention of claim 2 is characterized in that, in the invention of claim 1 , the joint of the inner ring is joined by welding or an adhesive.

A one-way clutch according to a third aspect of the invention is characterized in that, in the first aspect of the invention, a fitting portion is provided at the joint of the inner ring, and the joint of the inner ring is fitted and joined to the fitting portion. And

A one-way clutch unit according to a fourth aspect of the invention includes the one-way clutch according to any one of the first to third aspects, and a resin shaft that passes through the inner ring and the shield member and is connected to the inner ring. It is characterized by that.

The one-way clutch unit according to the invention of claim 5 is characterized in that, in the invention of claim 4 , a gear for transmitting power to the resin shaft is provided.

A one-way clutch unit according to a sixth aspect of the invention is characterized in that, in the fourth or fifth aspect of the invention, a rotating roller member is attached to the one-way clutch.

According to the first aspect of the present invention, since the inner ring that contacts the inner diameter surface of the outer ring is provided so that the shaft does not directly contact the inner diameter surface of the outer ring, the durability can be improved without using a shaft with improved durability. An excellent one-way clutch can be used. Further, the inner ring is manufactured by punching an iron plate with a press, joining the joint, barrel polishing, increasing the hardness by heat treatment, and performing centerless polishing, so that the inner ring can be manufactured easily. Furthermore, since the joint of the inner ring is slanted, vibration when passing through the rolling elements can be prevented and quality is improved.

According to the invention of claim 2 and the invention of claim 3, since the joining of the seam is ensured, the quality is further improved. According to the fourth to sixth aspects of the invention, since the resin shaft is used, the cost can be reduced, and the resin shaft can be integrally formed with the gear portion.

The block diagram which shows an example of the one-way clutch which concerns on embodiment of this invention. The block diagram which shows an example of the inner ring | wheel of the one-way clutch which concerns on embodiment of this invention. Explanatory drawing of the diagonal cut of the thickness direction of the both ends of the iron plate punched in the manufacture process of the inner ring | wheel in embodiment of this invention. Explanatory drawing of the diagonal cut of the thickness direction and the width direction of the both ends of the iron plate punched in the manufacture process of the inner ring | wheel in embodiment of this invention. The block diagram which shows another example of the inner ring | wheel of the one-way clutch which concerns on embodiment of this invention. The block diagram which shows an example of the resin shaft in embodiment of this invention. The block diagram of the one-way clutch unit which attached the rotation roller member to the one-way clutch which attached the shaft shown in FIG. The block diagram which shows an example of the conventional one-way clutch.

  Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an example of a one-way clutch 10 according to an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a partially cutaway rear view, and FIG. It is sectional drawing in the YY line of 1 (a). In this embodiment, a cylindrical inner ring 17 inserted into the inner diameter of the outer ring 11 is added to the conventional example shown in FIG. The same elements as those in the conventional example shown in FIG.

  The inner ring 17 of the one-way clutch 10 is formed in a cylindrical shape and has a through hole 12 for allowing the shaft to pass therethrough. The outer diameter surface of the inner ring 17 is sized to contact the inner diameter surface of the outer ring 11. When the inner ring 17 is inserted into the inner diameter of the outer ring 11, the outer ring 11 contacts the rolling element 14 housed in the wedge-shaped space 13 of the outer ring 11. To do. A leaf spring 15 that presses the rolling element 14 is also housed in the wedge-shaped space 13.

  The through hole of the shield member 16 that seals the wedge-shaped space 13 so that the rolling elements 14 do not exit the wedge-shaped space 13 is formed smaller than the outer diameter of the inner ring 17. Thereby, when the inner ring 17 is inserted into the inner diameter of the outer ring 11, the inner ring 17 is prevented from passing through the outer ring 11 and coming out. The through hole of the shield member 16 is formed to have substantially the same size as the inner diameter of the inner ring 17, and the shaft passes through the shield member 16 and the inner ring 17.

  A shaft connection recess 18 for connecting the inner ring 17 to the shaft is provided at one end of the inner ring 17. The shaft coupling recess 18 is coupled to the shaft by engaging with a shaft coupling projection formed on the shaft.

  FIG. 2 is a configuration diagram illustrating an example of the inner ring 17 of the one-way clutch according to the embodiment of the present invention. FIG. 2 (a) is a front view, and FIG. 2 (b) is a cross-sectional view taken along the line ZZ. 2 (c) is a top view. The inner ring 17 is formed in a cylindrical shape by punching the iron plate 19 with a press, curling the punched iron plate 19 and joining the seam 20.

  First, the iron plate 19 is punched with a press, and the punched iron plate 19 is curled to create a cylindrical workpiece. When the iron plate 19 is punched with a press, the shaft coupling recess 18 is also formed. Furthermore, when punching out the iron plate 19 with a press, as shown in FIG. 3, the thickness direction of the both ends of the iron plate 19 is cut diagonally. This is to form a cylinder when the iron plate 19 is curled. That is, one length h1 of the back surface of the iron plate 19 is the length of the outer circumference of the cylinder when the iron plate is curled, and the other length h2 is the length of the inner circumference of the cylinder. The thickness direction of both ends of 19 is cut diagonally.

  Next, the iron plate 19 is curled to join the joints 20 to form a cylindrical workpiece, and then barrel-polished. Barrel polishing is polishing that suppresses springback after heat treatment by performing deburring, rounding, and the like by relative friction between a cylindrical workpiece and an abrasive, and by tightening. After this barrel polishing, the hardness is increased by heat treatment and centerless polishing is performed. Centerless polishing is polishing in which a cylindrical workpiece is supported between a fixed workpiece support blade and a rotating adjustment wheel and a grinding wheel, and the outer periphery of the workpiece is ground while adjusting the rotation and feed of the cylindrical workpiece.

  Thus, the inner ring 17 is produced by punching the iron plate 19 with a press, curling the punched iron plate 19, joining the joint 20 and barrel polishing, increasing the hardness by heat treatment, and performing centerless polishing. To do. As a result, the inner ring 17 can be easily manufactured and the cost can be reduced as compared with manufacturing by cutting out from a round iron bar.

  As described above, the shaft is inserted through the shield member 16 and the inner ring 17, and the shaft is coupled to the inner ring 17 by the shaft coupling convex portion provided on the shaft and the shaft coupling concave portion 18 of the inner ring 17. Now, when the shaft rotates in the direction of arrow A in FIG. 1B, the inner ring 17 in contact with the rolling element 14 also rotates in the direction of arrow A, and the rolling element 14 is pushed by the leaf spring 15 in the direction of arrow A. Moving. As a result, the wedge-shaped space 13 moves from the wide part toward the narrow part, so that the rolling element 14 is brought into mesh with the inner ring 17 and the outer ring 11 in the wedge-shaped space 13, and the rotational force of the shaft is transmitted to the outer ring 11. Will be.

  On the other hand, when the shaft rotates in the direction of arrow B, which is the opposite direction of arrow A, the inner ring 17 in contact with the rolling element 14 also rotates in the direction of arrow B, and the rolling element 14 presses the leaf spring 15 and wedges. It moves to the wide part of the shape space 13. Accordingly, the meshing state of the rolling elements 14 is released, the rotation of the shaft is idle, and the rotational force is not transmitted to the outer ring 11.

  Thus, the one-way clutch transmits the rotational force in only one direction of the shaft to the outer ring 11. In this case, it is the outer diameter surface of the inner ring 17 that contacts the inner diameter surface of the outer ring 11, and the shaft does not contact the inner diameter surface of the outer ring 11. Therefore, even if the durability of the shaft is relatively weak compared to the one-way clutch, the shaft can be used. This eliminates the need to increase the durability of the shaft.

  In the above description, the seam 20 obtained by curling the iron plate 19 is formed parallel to the axial direction of the cylinder of the inner ring 17 as shown in FIG. As shown, it may be formed obliquely in the axial direction of the cylinder of the inner ring 17. FIG. 4 is an explanatory diagram of oblique cuts in the thickness direction and width direction of both ends of the iron plate 19 punched in the process of manufacturing the inner ring in the embodiment of the present invention, and FIG. 4 (b) is a plan view of the punched iron plate 19, and FIG. 4 (c) is a side view of the punched iron plate 19.

  When punching the iron plate 19 with a press, the thickness direction of both ends of the iron plate 19 is cut obliquely as shown in FIG. 3, and further, the width direction of both ends of the iron plate 19 is shown in FIG. 4 (b). Cut diagonally. Thereby, both ends of the iron plate 19 are cut in both the thickness direction and the width direction as shown in FIG. 4C, and the seam 20 when the iron plate 19 is curled is as shown in FIG. The inner ring 17 is formed obliquely in the axial direction of the cylinder. Since the joint 20 of the inner ring 17 is inclined, it is possible to prevent vibration when passing through the rolling elements and improve the quality.

  Here, the joint 20 of the inner ring 17 may be joined by welding or an adhesive. Moreover, as shown in FIG. 5, the fitting part 21 may be provided in the joint 20 of the inner ring | wheel 17, and the fitting part 21 may be fitted and joined. FIGS. 5A and 5B are configuration diagrams of the inner ring 17 having the fitting portion 21 at the joint 20. FIG. 5A is a front view and FIG. 5B is a cross-sectional view taken along the line U-U.

  FIG. 5 shows a case where the joint 20 of the inner ring 17 is formed obliquely in the axial direction of the cylinder of the inner ring 17. The seam 20 is provided with a fitting part 21, and the fitting part 21 of the seam 20 is fitted when the iron plate 19 is curled to form a cylinder. Thereby, since the joining of the joint 20 is ensured, the quality is improved.

  As described above, since the shaft is inserted through the inner ring 17, it does not contact the inner diameter surface of the outer ring 11. Therefore, even if the durability of the shaft is relatively weak compared to the one-way clutch, the shaft can be used. Therefore, a resin shaft can be used as the shaft.

  FIG. 6 is a block diagram showing an example of a resin shaft, FIG. 6 (a) is a side view, and FIG. 6 (b) is a front view. The shaft 22 is made of resin, and the shaft portion 23 is provided with a shaft coupling convex portion 24 that engages with the shaft coupling concave portion 18 of the inner ring 17. The shaft portion 23 is integrally molded with a gear 25 for transmitting power to the shaft portion 23 of the shaft 22. The gear 25 is a drive gear for rotating the shaft portion 23 or a driven gear that transmits the rotation of the shaft portion 23.

  Thus, since the shaft 22 can be formed of resin, the gear 25 can be integrally formed with the shaft 22. Therefore, cost can be reduced. The shaft 22 is attached to a one-way clutch to form a one-way clutch unit.

  FIG. 7 is a configuration diagram of a one-way clutch unit in which a rotary roller member 26 is attached to the one-way clutch 10 to which the shaft 22 shown in FIG. 6 is attached. The shaft portion 23 of the shaft 22 is mounted through the inner ring 17 and the shield member 16 of the one-way clutch 10, and the shaft coupling concave portion 18 of the inner ring 17 and the shaft coupling convex portion 24 of the shaft portion 23 are engaged with each other, so that the shaft 22 Is connected to the inner ring 17 to form a one-way clutch unit.

  Further, the rotating roller member 26 is attached to the one-way clutch 10 of this one-way clutch unit. The roller portion 27 of the rotating roller member 26 is, for example, a rubber roller that continuously feeds cut sheets from a sheet stock of a copying machine.

  For example, when the shaft portion 23 of the shaft 22 rotates, the inner ring 17 and the outer ring 11 mesh with each other, and when the rotational force of the shaft portion 23 is transmitted to the outer ring 11, the roller portion 27 is rotated. As a result, the roller unit 27 feeds the cut sheet.

  When the cut paper that has been sent out is taken in by another roller unit 27, if the rotational speed of the other roller unit 27 is greater than the rotational speed of the roller unit 27 on the sending side, the roller unit 27 on the sending side When the rotation of the shaft portion 23 of 22 is rotated to the opposite side, the same state is obtained. In this state, the meshing between the inner ring 17 and the outer ring 11 is released, and the rotation of the shaft portion 23 of the shaft 22 becomes idle, and no rotational force is transmitted to the outer ring 11. Accordingly, the cut sheet is fed by the rotation of another roller unit 27.

  According to the embodiment of the present invention, since the inner ring 17 is provided, it is the outer diameter surface of the inner ring 17 that contacts the inner diameter surface of the outer ring 11, and the shaft 22 does not contact the inner diameter surface of the outer ring 11. Therefore, even if the durability of the shaft 22 is relatively weak compared to the one-way clutch, the shaft 22 can be used. For example, a resin shaft can be used.

  The inner ring 17 is manufactured by punching the iron plate 19 with a press, curling the punched iron plate 19, joining the joint 20 and barrel polishing, increasing the hardness by heat treatment, and performing centerless polishing. Compared with manufacturing by cutting, the inner ring 17 can be easily manufactured and the cost can be reduced.

  Since a resin shaft can be used, the gear 25 can be formed integrally with the shaft 22 and the cost can be reduced. In this way, it is possible to provide a one-way clutch and a one-way clutch unit that are excellent in durability, high in quality, and reduced in the number of processing steps.

  The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... One-way clutch, 11 ... Outer ring, 12 ... Through-hole, 13 ... Wedge-shaped space, 14 ... Rolling body, 15 ... Leaf spring, 16 ... Shield member, 17 ... Inner ring, 18 ... Shaft coupling recessed part, 19 ... Iron plate, 20 ... Seam, 21 ... Fitting part, 22 ... Shaft, 23 ... Shaft part, 24 ... Shaft coupling convex part, 25 ... Gear, 26 ... Rotating roller member, 27 ... Roller part

Claims (6)

An outer ring made of a sintered member having a wedge-shaped space formed on a cylindrical inner surface,
Rolling elements located in the wedge-shaped space of the outer ring;
A leaf spring that presses the rolling element from the wide part to the narrow part of the wedge-shaped space;
A cylindrical inner ring that is inserted into the inner diameter of the outer ring and whose outer diameter surface is in contact with the inner diameter surface of the outer ring;
A shield member that seals the wedge-shaped space so that the rolling elements do not exit the wedge-shaped space and prevents the inner ring from penetrating through the outer ring when the inner ring is inserted into the outer ring. Prepared,
The inner ring is produced by punching an iron plate with a press, curling the punched iron plate, joining a joint and barrel polishing, increasing the hardness by heat treatment, performing centerless polishing, and punching the iron plate with a press. The width direction of both ends of the iron plate is cut diagonally so that the joint of the inner ring is diagonal,
When the inner ring rotates from the wide part of the wedge-shaped space toward the narrow part, the rolling element is pressed against the narrow part to rotate integrally with the outer ring, and the inner ring rotates from the narrow part to the wide part of the wedge-shaped space. A one-way clutch characterized in that, when rotating toward the center, the rolling element is released from being pressed against the narrow portion and idled. The one-way clutch according to claim 2 or 1 , wherein the joint of the inner ring is joined by welding or an adhesive. The one-way clutch according to claim 1 , wherein a fitting portion is provided at a joint of the inner ring, and the joint of the inner ring is joined by fitting the fitting portion. The one-way clutch according to any one of claims 1 to 3 ,
A one-way clutch unit comprising: a resin shaft penetrating the inner ring and the shield member and connected to the inner ring. The one-way clutch unit according to claim 4 , wherein a gear for transmitting power to the resin shaft is provided. The one-way clutch unit according to claim 4 or 5 , wherein a rotation roller member is attached to the one-way clutch.

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